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<p>Bis(thiourea) cadmium chloride (BTCC) is a semiorganic nonlinear optical crystal with promising second harmonic generation (SHG) efficiency. In this study, L-proline-doped BTCC crystals were grown for the first time using the slow solvent evaporation method with doping concentrations of 2–8&#xa0;mol%. Single-crystal X-ray diffraction confirmed that the orthorhombic crystal structure of BTCC is retained upon doping. Spectroscopic analyses verified the incorporation of L-proline into the crystal lattice. Optical studies revealed enhanced transparency and an increased optical bandgap for the doped crystals. Thermal analysis demonstrated improved thermal stability with increasing L-proline content. SHG measurements using a Nd:YAG pulsed laser showed enhanced nonlinear optical efficiency in the doped samples compared to pure BTCC. Dielectric and electrochemical investigations indicated reduced dielectric loss and increased capacitance upon doping. The combined improvements in optical, thermal, electrical, and nonlinear properties highlight L-proline-doped BTCC as a promising material for optoelectronic and photonic device applications.</p>

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Structural, spectral, and electrical studies of pure and L-proline-doped BTCC crystals for optoelectronic applications

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Bitto John,
  • G. Aryadevi,
  • Geethu Joseph,
  • R. Santhosh Kumar,
  • Alex Joseph,
  • Ginson P. Joseph

摘要

Bis(thiourea) cadmium chloride (BTCC) is a semiorganic nonlinear optical crystal with promising second harmonic generation (SHG) efficiency. In this study, L-proline-doped BTCC crystals were grown for the first time using the slow solvent evaporation method with doping concentrations of 2–8 mol%. Single-crystal X-ray diffraction confirmed that the orthorhombic crystal structure of BTCC is retained upon doping. Spectroscopic analyses verified the incorporation of L-proline into the crystal lattice. Optical studies revealed enhanced transparency and an increased optical bandgap for the doped crystals. Thermal analysis demonstrated improved thermal stability with increasing L-proline content. SHG measurements using a Nd:YAG pulsed laser showed enhanced nonlinear optical efficiency in the doped samples compared to pure BTCC. Dielectric and electrochemical investigations indicated reduced dielectric loss and increased capacitance upon doping. The combined improvements in optical, thermal, electrical, and nonlinear properties highlight L-proline-doped BTCC as a promising material for optoelectronic and photonic device applications.